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No spark While driving just shut down. Either backfired or sparked under vehicle twice. Replaced Microprocessor, egnition module and crank shaft probe F250 ford truck 350 engine, California specia 1983 model
Re: No spark While driving just shut down. Either...
Tough to tell without being there but it may be your timing chain slipping or broken. At that age of vehicle (how many miles) if the timing chain has not been replaced - that would be my suspect.
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You will need to replace the crank angle/position sensor near the crank pulley. A photo of the sensor is attached. The sensors wear out due to heat and cold cycles and internal corrosion.
MasterPro Ignition - Crankshaft Position Sensor
Oreilly's Auto Parts part number is:
Line: MPI ' Part # 2-96054
What is year--make--model? If computer controlled, did you check for applicable codes? If your obd2 some of the national brand auto stores will check codes for free.
When the problem is ongoing, if it cranks good but won't start, have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
On my falcon the same thing happened changed dizzy, coil even got new spark plugs what it turned out to be was auxiliary shaft that turns the dizzy or the dizzy module if you got coil packs. You can't see down the dizzy hole because its under the inlet manifold so take photo with your phone and you might see little bits of metal The auxiliary shaft teeth on the dizzy end where worn out and folding over so it can't give the proper spark at right time so went to wreckers 20 bucks for another. ford says it can't happen but I know quite a few engines with same problem
An engine shut not backfire unless the timing is off, it has a burnt valve or an exhaust restriction. Since the crank sensor was the catalyst for the problem, I would again check it. It definately affects the timing for the fuel and spark
it sounds like your ignition module is failing, when the car dies, take off one spark plug wire from the coil and crank the key, see if there is spark. one other issue may be the crank position sensor which can also stop the module from firing a spark
is the check engine light on !! if so scan it for the problem code to find out what area to start at. but it does sound like a bad crank sensor. here are the symtoms of a bad crank sensor,--- shuts off while driving down road and wont start for at least 10 minutes and also. timing will be out of sync. more than likely engine will not start. ( engine backfire )or irregular RPMS. if vehicle starts at all, it controls timing and sends info to pcm. no spark or pulse at injectors. have a good day !!
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